[oldman]

Originally Posted by Petrol Head

The 375 horse L78 was really closer to 325 horse by today’s SAE net version 2.0 rating calc. Remember, those engines were rated in SAE gross until 1974, then SAE net version 1.0 from 1974-2003. In ‘04 the SAE revised their rating system again. The 455 horse in modern Camaros is a realistic number. Those old muscle cars felt fast but realistically they were slower than a modern V6 Camaro.

That 450 hp header mod must be with unicorn dust.

If you connect an old M22 to a modern LT1 the LT1 would shred it to pieces.

There are many dyno out with the numbers I listed and long tubes, the gen v LT1 BHP is found here: 518 HP.

Here is a 396 dyno at 458 HP with headers (which I said at the get go) And yes 454, 455, 400 Ram Air, 427 could either dyno at the 450 HP with LT or 500 ft-lbs (which is what breaks the trans).

https://www.hotrod.com/articles/chev...actory-rating/

https://www.hotrod.com/articles/518-...traight-crate/

I don't know why you are going with SAE net, I clearly stated headers.

Let's be clear tens of thousands of GM BB engines with headers were raced for decades with Muncie transmissions. Did they fail, yes, can you get new cases, shafts syncros etc to have a Muncie live a long life at say 500 HP... probably so. What is the rating of the TR6060 installed in the LT1 Camaro 560 ft - lbs. Stronger than a Muncie out of the box, and there is not much that separates the TR6060 from a T56 mag at 700 ft-lbs. The Muncie's claim to fame is not strength anyway, as I've stated it was the ability to shift. The aluminum Muncie was also light.

All you ever wanted to know:
https://oppositelock.kinja.com/so-yo...mis-1823051016